Finding the Third Proportional to 54,090 and 80,684

Step by Step Solution

1. Step 1: Write the proportion equation
   54,090 : 80,684 = 80,684 : x
2. Step 2: Convert to fraction form
   54,090/80,684 = 80,684/x
3. Step 3: Cross multiply
   54,090x = 80,684 × 80,684
4. Step 4: Simplify right side
   54,090x = 6,509,907,856
5. Step 5: Solve for x
   x = 6,509,907,856/54,090
6. Step 6: Final answer
   x = 120,353.26